With the inspiration from lab 3, Digital Waveform Synthesis, I want to make a project that can process and playback music. Some songs are pre-stored in memory. They can be played back just like a real piano keyboard. Also the user can input a song on a simple keyboard that is an octave long. The song is played in real time. Later, the user can ask
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the 8051 to transpose the song to different keys, or to its parallel minor. This project is interesting and useful because transposing keys is a big part of music theory study. The octave long keyboard is the mechanical part of this project. The layout of the keyboard can be seen in figure 1. To make the hole drilling process easier, a tupperware container top is used as the base of the keyboard. It turned out to be a plus that it provides a bouncy feeling for the fingers. Sixteen momentary switches are the main components of this octave long keyboard. Twelve out of the sixteen switches are the keys in an octave (seven white keys and five black keys). The other four are for user selections (Play plays back the song that was input by the user. Transpose transposes the stored song to another key. Minor transposes the stored song from major to its parallel minor. Done should be pressed after the user is done inputting a song. ) There are two regular on-off switches on the far right side for selection purposes as well. (The upper one selects between twinkle, twinkle, little star, and Mary and a little lamb. The bottom one selects between playing the stored songs mode and user inputting songs mode). The electrical connections of the momentary switches are similar to the calculator keypad that is used in class. Figure 2a shows the wiring of the sixteen momentary switches. Figure 2b shows the wiring of the two regular...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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